Patents by Inventor Isao Takashima

Isao Takashima has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Basic magnesium sulfate fiber-reinforced polypropylene resin composition and injection molded article using the resin composition
    Patent number: 6800681
    Abstract: Disclosed is a polypropylene resin composition comprising (A) from 40 to 98% by weight of polypropylene resin, (B) from 1 to 30% by weight of basic magnesium sulfate fiber having a surface treated with montan wax wherein fibers contained in primary fibers have an average fiber length of from 7 to 10 &mgr;m and the percentage of primary fibers containing fibers having a fiber length of 20 &mgr;m or more is 10% by weight or less and (C) from 1 to 30% by weight of talc, provided that the total weight of the components (A), (B) and (C) is adjusted to 100% by weight.
    Type: Grant
    Filed: August 30, 2002
    Date of Patent: October 5, 2004
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Kenichi Ohkawa, Moriyasu Shimojo, Isao Takashima
  • Polypropylene resin composition and injection molded article
    Patent number: 6656987
    Abstract: A polypropylene resin composition which comprises 100 parts by weight of a propylene homopolymer, 0.01 to 1.0 part by weight of phosphoric acid ester type nucleating agent (a) and 1.5 to 5 parts by weight of talc (b), wherein the composition satisfies the following condition (1): (1) the injection molded article of the polypropylene resin composition has degrees of orientation A and orientation B measured by wide angle X-ray diffraction of not less than 35 and not less than 300, respectively.
    Type: Grant
    Filed: November 21, 2001
    Date of Patent: December 2, 2003
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Isao Takashima, Kenichi Ohkawa, Tomohisa Fukao
  • Basic magnesium sulfate fiber-reinforced polypropylene resin composition and injection molded article using the resin composition
    Publication number: 20030060553
    Abstract: Disclosed is a polypropylene resin composition comprising (A) from 40 to 98% by weight of polypropylene resin, (B) from 1 to 30% by weight of basic magnesium sulfate fiber having a surface treated with montan wax wherein fibers contained in primary fibers have an average fiber length of from 7 to 10 &mgr;m and the percentage of primary fibers containing fibers having a fiber length of 20 &mgr;m or more is 10% by weight or less and (C) from 1 to 30% by weight of talc, provided that the total weight of the components (A), (B) and (C) is adjusted to 100% by weight.
    Type: Application
    Filed: August 30, 2002
    Publication date: March 27, 2003
    Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventors: Kenichi Ohkawa, Moriyasu Shimojo, Isao Takashima
  • Polypropylene resin composition and injection molded article
    Publication number: 20020095004
    Abstract: A polypropylene resin composition which comprises 100 parts by weight of a propylene homopolymer, 0.01 to 1.0 part by weight of phosphoric acid ester type nucleating agent (a) and 1.
    Type: Application
    Filed: November 21, 2001
    Publication date: July 18, 2002
    Inventors: Isao Takashima, Kenichi Ohkawa, Tomohisa Fukao